MOBILE, Alabama -- Four days after being shot, 17-year-old Summer Moody was given a less than 1 percent chance of survival after her condition worsened Wednesday night, a family spokesman said today.

Moody was shot in the back of the head at about 4 a.m. Sunday, while she and three other teens were on Gravine Island.

She has been in the University of South Alabama Medical Center since the shooting. She had been described as comatose Wednesday.

On Thursday morning, a statement from Robert Stankoski, the lawyer representing Moody's family, said doctors performed a two-hour emergency surgery, removing the top of her skull to ease pressure on her brain stem.

Doctors did not know if the operation would relieve the pressure and were monitoring her condition today.

Moody had been taken off a respirator Wednesday, but was placed back on the device Thursday, the statement said.

Most victims in similar state would be given a 99 percent fatality rate, Stankoski said.

The three teens who were with Moody on Sunday, Scott Byrd and Dillion Tyree of Stapleton and Daniel Parnell of Bay Minette, have been charged with first-degree burglary.

Earlier this week, Sheriff Huey Hoss Mack said the three are charged with breaking into two fishing camps on the island. Mack said two men on the island heard the teens and each fired one shot. One of the bullets hit Moody. No one else was injured in the incident.